Clip-on spring for a windshield wiper



FIG. 1 is an isometric view of the design installed on a wiper in stippled line since it does not form part of the design

FIG. 2 is an isometric view

FIG. 3 is a top view

FIG. 4 is a side view

FIG. 5 is a bottom view; and,

FIG. 6 is a front view. 

CLAIM The ornamental design for a clip-on spring for a windshield wiper, as shown. 